CN109991480B - Detection device and method of M-Bus signal instrument under intentional radiation interference - Google Patents
Detection device and method of M-Bus signal instrument under intentional radiation interference Download PDFInfo
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- 230000005855 radiation Effects 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 title claims abstract description 20
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- 238000012360 testing method Methods 0.000 claims abstract description 30
- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims description 17
- 239000013307 optical fiber Substances 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 14
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- 238000009825 accumulation Methods 0.000 claims description 3
- 239000011358 absorbing material Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
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- 230000005670 electromagnetic radiation Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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Abstract
The invention relates to the field of signal instrument quality detection, in particular to a detection device and method for an M-Bus signal instrument under intentional radiation interference. The technical problem of how to accurately detect the M-Bus instrument when the M-Bus instrument is applied with intentional interference is solved. The device comprises a signal monitoring module, a radiation interference module and a control module; the radiation interference module is controlled by the control module and used for emitting interference electromagnetic waves to the M-Bus signal instrument to be detected, and the signal detection module is used for realizing the conversion between the RS-232/485 signal and the M-Bus signal and comprises a signal converter used for connecting the M-Bus signal instrument to be detected and the control module and a shielding box used for shielding interference of the electromagnetic waves to the signal converter. The invention provides a technology capable of ensuring the reliability and accuracy of a test environment under the condition of intentional interference of M-Bus signals. The invention utilizes the electromagnetic shielding technology, eliminates the problem of interference of the communication line of the tested instrument to a great extent, and can accurately carry out fault diagnosis of the M-Bus signal instrument according to the test intention.
Description
Technical Field
The invention relates to the field of instrument quality detection, in particular to a detection device and method for an M-Bus signal instrument under intentional radiation interference.
Background
The disadvantage of the economic data acquisition mode of manual meter reading in daily life is increasingly exposed, the meter reading workload is large, and the inevitable error meter reading happens, which definitely brings unnecessary trouble to users. The meter reading is performed in a centralized manner by adopting a modern communication mode, and timely and accurate metering data can be obtained without going out. M-Bus is a field Bus developed for meeting the needs of networking and remote meter reading of various measuring instruments, can be used for automatic meter reading of meters such as water meters, electric meters, gas meters, heat meters and the like, has been widely applied in the field of intelligent measuring instruments at present, and has become European standard. In China, industry standards have been incorporated by the national construction department.
However, with the development of industry and information industry in modern society, the surrounding environment is filled with electromagnetic noise everywhere, and for an M-Bus meter, whether the M-Bus signal communication is normal or not is one of important indexes for judging that the meter can work normally under the strong electromagnetic radiation environment, so that a special test site and environment need to be provided for verification. The standard test procedure is generally required to be carried out in a semi-anechoic chamber, and the intentional electromagnetic wave which is generated in the anechoic chamber and meets the test requirement can interfere with the M-Bus instrument, so that when the tested device is subjected to the radio frequency electromagnetic field radiation immunity test, the input and output signals of the device are required to be monitored and analyzed in real time, and the influence degree of the intentional interference on the device and the signal transmission medium is required to be distinguished by necessary means.
At present, an intentional interference coupling path is usually added for the tested device with an M-Bus communication line, a lead of an M-Bus signal instrument is led out of a radio-controlled darkroom, however, part of high-frequency radiation can be led out of the darkroom by adding the lead, radiation is generated for staff, and meanwhile, the physical structure of the device is strictly changed due to the fact that the length of the lead is increased, so that the test condition cannot be well met. Therefore, a device and a method for accurately detecting the M-Bus instrument under the electromagnetic radiation interference state are highly needed.
Disclosure of Invention
The invention provides a detection device and a detection method of an M-Bus instrument under intentional radiation interference, which mainly solve the following problems:
(1) When the M-Bus instrument is subjected to intentional interference, namely the analog instrument works in a real electromagnetic interference working environment, a method for monitoring whether the instrument can work normally or not on line is needed to be provided.
(2) When the communication line of the M-Bus instrument is subjected to intentional interference, the transmission of normal communication signals is affected, so that a certain method is needed to be adopted, the influence of the intentional interference on a communication medium is eliminated, and the real response condition of tested equipment is restored.
The detection device of the M-Bus instrument under the intentional radiation interference is realized by adopting the following technical scheme: the detection device of the M-Bus signal instrument under the intentional radiation interference comprises a signal monitoring module, a radiation interference module and a control module; the radiation interference module is controlled by the control module and used for emitting interference electromagnetic waves to the M-Bus signal instrument to be detected, and the signal detection module is used for realizing the conversion between the RS-232/485 signal and the M-Bus signal and comprises a signal converter used for connecting the M-Bus signal instrument to be detected and the control module and a shielding box used for shielding interference of the electromagnetic waves to the signal converter.
The device sends corresponding signal instructions to an M-Bus signal instrument to be detected through a signal monitoring module, receives signals fed back by the instrument and inputs the signals to a control module; the radiation interference module is used for simulating an external interference electromagnetic field and adjusting the field intensity of the interference electromagnetic field under the control of the control module so as to better simulate different electromagnetic interference environments; the shielding box is used for protecting the signal converter from the electromagnetic field emitted by the radiation interference module so as to ensure that the signal sent by the instrument to be detected can be accurately received under the condition of electromagnetic interference, and the accuracy of the detection result is ensured.
Further, the signal converter comprises a first part and a second part which are connected through optical fibers, wherein the first part is connected with the control module, the second part is connected with an M-Bus signal instrument to be detected, and the second part is arranged in the shielding box; the first part is used for realizing the conversion between the RS-232/485 signal and the optical signal, and the second part is used for realizing the conversion between the optical signal and the M-Bus signal; the radiation interference module comprises a cascaded signal source, a power amplification group, an antenna group and a directional coupler, wherein the signal source is controlled by the control module; the control module adopts an industrial personal computer.
The uplink direction of the first part of the signal converter is to convert the data received from the RS232 interface, then the data is transmitted to the transmitting end of the optical fiber interface circuit through the driving circuit, the data is firstly converted into optical signals at the transmitting end, the physical connection of the optical fibers is optical fibers, the transmission of the optical fibers is based on an optical pulse communication mode, and the optical signals are transmitted to the second part of the signal converter; the downlink direction of the first part is that the receiving end of the optical fiber interface restores the received signal into an electric signal by the optical detector, the electric signal is converted by the conversion circuit and is transmitted to the RS-232/485 interface circuit to be transmitted to the upper PC. Therefore, the first part of the signal converter is connected with the RS232 interface of the industrial personal computer. The second part of the signal converter is similar to the first part, and the processes of optical signal data transmission, receiving and debugging are also optical transmitters and optical receivers, but only the optical signals are converted into M-Bus signals.
Further, the system also comprises a video acquisition control module; the video acquisition control module comprises a camera and a remote controller, and consists of a tripod and a wall frame; the Cam8 camera of the company PONTIS and the Con4102 remote controller are adopted, and the camera Cam8 can bear 200V/m field intensity. Can be remotely controlled by a remote controller to adjust the angle and the focal length.
The video acquisition control module is responsible for the acquisition of video signals of the camera, the video signals are displayed in software after being acquired and automatically recorded in a computer hard disk, and in addition, the module can also perform angle control and focal length adjustment.
The detection method of the M-Bus instrument under the intentional radiation interference is realized by adopting the following technical scheme: a detection method of an M-Bus signal instrument under intentional radiation interference comprises the following steps:
(1) Placing an M-Bus signal instrument to be detected in a half-wave dark room, wherein an antenna group, a shielding box and a camera are all positioned in the half-wave dark room;
(2) Inputting an M-Bus instrument number to be detected at an interface of an industrial personal computer, generating a serial port read data command string according to the rule of an industry standard CJ/T188 user-used metering instrument data transmission technical condition, adding a checksum byte, and simultaneously configuring serial port number, baud rate and frame format parameters;
(3) Setting a required field intensity through an industrial personal computer, and transmitting interference electromagnetic waves with the set field intensity to an M-Bus signal instrument to be detected through an antenna;
(4) At the moment, the test starts from the frequency of the designated frequency point, the industrial personal computer automatically sends a read data command character string, the M-Bus signal instrument receives the character string and then performs accumulation and verification, judges whether the character string is established normally or not, and returns a result character string;
(5) The industrial personal computer receives the character string output by the M-Bus instrument to be detected, analyzes the character string to obtain a specific numerical value, and automatically draws a graph with the frequency as an abscissa and the numerical value of the measured physical quantity of the M-Bus instrument as an ordinate by built-in software of the industrial personal computer;
(6) Judging whether the current test frequency point is ended or not, if not, returning to the step (3), and continuously detecting the next frequency point; and after all the frequency points are tested, the test is stopped, and the experimental result is judged by combining the curve graph.
By adopting the method, the state of the instrument to be detected can be accurately detected under the set field intensity, and the accuracy of the detection result is ensured.
Furthermore, in the test process, the direction and the focal length of the camera can be adjusted by using the remote controller, the auxiliary monitoring is carried out on the M-Bus signal instrument to be tested, if the M-Bus signal instrument has the phenomena of screen flashing and screen blacking, the phenomena can be directly observed, and the judgment of the test result can be conveniently carried out by combining the graph in the step (5).
The invention has the beneficial effects that: (1) The invention provides a scheme for truly simulating the working environment of the tested equipment under the intentional interference of the M-Bus signal and ensuring the reliability and the accuracy of the testing environment.
(2) The invention utilizes the electromagnetic shielding technology, eliminates the problem of interference of the communication line of the tested instrument to a great extent, and can accurately carry out fault diagnosis of the M-Bus signal instrument according to the test intention.
(3) The invention can automatically record detection data and generate reports, realize full-automatic detection and judgment, and is favorable for realizing comprehensive technical integration and quality management.
Drawings
Fig. 1 is a block diagram of a signal monitoring module, tx represents optical fiber interface data transmission, and Rx represents optical fiber interface data reception.
Fig. 2 is a schematic diagram of this device.
Fig. 3 is a practical configuration diagram of this device.
FIG. 4 is a flow chart of monitoring of an M-Bus signal meter (water meter).
FIG. 5 is a graph of test results for an M-Bus signaling meter (water meter).
Detailed Description
The device of the invention is mainly divided into four modules: the system comprises a video acquisition control module, a signal monitoring module, a radiation interference module and a control module. The control module is a control unit based on a PC, and an industrial personal computer is actually used and is mainly used for software control and information interaction; the radiation interference module is formed by cascading equipment such as a signal source, a field intensity probe, a radio frequency change-over switch, an antenna group, a power amplifier group, a directional coupler and the like; the video acquisition control module is divided into two shielding cameras and a remote controller, is mainly responsible for camera video signal acquisition, video signals are displayed in software after being acquired, video is stored in a computer hard disk, and in addition, the module can also perform angle control and focal length adjustment; the signal monitoring module comprises a signal converter and a shielding box, as shown in fig. 1, which shields the second part of the signal converter from intentional interference.
The signal converter mainly realizes the conversion function from an RS-232/485 signal to an M-Bus signal, and consists of two parts, wherein the first part is used for realizing the conversion between the RS-232/485 signal and an optical signal, and the first part firstly converts a serial port signal into a TTL level and then converts the signal into the optical signal through a driving circuit for transmission. The used module is a serial port-to-optical fiber module, the model is UT-277SM, and the module supports the transmission of two data signals: the data transmission automatic enabling control circuit of RS-232/485 is also provided, zero delay conversion time is realized, all serial ports are connected by binding posts, optical fibers are connected through two ST interfaces, and the data transmission directions of the two optical fibers are opposite.
The second part is used for realizing the conversion of the optical signal and the M-Bus signal, and the part converts the optical signal into the TTL level and then converts the TTL level into the M-Bus signal through the conversion circuit. The used module is an optical fiber-to-M-Bus module, which also supports the transmission of two data signals: data is transmitted and received while the data transmission is zero delay transition time. M-Bus signals are connected by adopting binding posts, and the supporting voltage difference is 36 V+/-3 percent of direct current. The optical fiber is connected by adopting two ST interfaces, and the data transmission directions of the two optical fibers are opposite.
The actual test configuration diagram is shown in fig. 3, and the M-Bus is placed in a semi-anechoic chamber when tested by the meter, and other control and auxiliary equipment are placed in a control chamber. The radiation system generates a signal with a certain frequency through a signal source, amplifies the signal through a power amplifier, outputs the signal to an antenna through a coaxial cable, generates field intensity meeting the test requirement and applies the field intensity to an M-Bus signal instrument, the M-Bus signal instrument to be tested is connected to an industrial personal computer through a signal converter, a second part of the signal converter is arranged in a shielding box, a camera is used as another monitoring means, and the influence of the instrument to be tested is checked in the test through an image mode. The shielding box is made of an aluminum material, a built-in wave-absorbing material is arranged, the optical fiber interface is an ST interface, the outer ST interface is connected with the first part of the signal converter, and the inner ST interface is connected with the second part of the signal converter.
The frequency range of the device is 26 MHz-6 GHz, the field intensity range is less than or equal to 30V/m, 75% field intensity of the uniform field in a specified area meets the range of 0 dB-6 dB, a calibrated field intensity calibration table is stored in software, and the calibration table comprises signal source output level, forward power of an antenna and field intensity information.
At the beginning of the test, the test procedure was completed according to the flow chart of fig. 4. The water meter is described as example 1.
Firstly, inputting an M-Bus water meter number in a software interface, generating a serial port read data command string according to the rule of an industry standard CJ/T188 user-used meter data transmission technical condition, adding a checksum byte, and simultaneously configuring parameters such as a serial port number, a baud rate, a frame format and the like.
And adding a test template, wherein the test template sequentially mirrors the hardware devices into the software, and carrying out combined configuration according to the frequency and power ranges, and then establishing effective links between the devices through the radio frequency change-over switch unit.
Setting required field intensity, automatically calling a calibration table by software, calculating the output level of a signal source according to a built-in formula of the software, outputting the power amplifier as 100% gain, and establishing the required field intensity.
At this time, the test starts from the frequency of the designated frequency point, the industrial personal computer automatically sends a read data command character string, the water meter receives the character string, then performs accumulation and verification, judges whether the normal establishment is established, and returns a result character string.
The industrial personal computer receives the character string and analyzes the character string to obtain a specific numerical value, and software automatically draws a graph with the frequency as an abscissa and the current accumulated flow of the water meter as an ordinate, as shown in fig. 5.
And judging whether the test frequency point is ended, if not, returning to the step 5 (taking the frequency of the next frequency point to be detected), and continuously detecting the next frequency point. And after all the frequency points are tested, the test is stopped. In the test process, the position and the focal length of the camera can be adjusted by the remote controller, the measured M-Bus signal instrument is aligned to carry out auxiliary monitoring, if the M-Bus signal instrument has phenomena such as screen flashing and screen blackening, the phenomena can be directly observed, and the test result can be conveniently judged by combining the graph.
Claims (3)
1. The detection method of the M-Bus signal instrument under the intentional radiation interference is realized by adopting a detection device of the M-Bus signal instrument under the intentional radiation interference, and the device comprises a signal monitoring module, a radiation interference module and a control module; the radiation interference module is controlled by the control module and used for emitting interference electromagnetic waves to an M-Bus signal instrument to be detected, and the signal monitoring module is used for realizing the conversion between an RS-232/485 signal and an M-Bus signal and comprises a signal converter used for connecting the M-Bus signal instrument to be detected and the control module and a shielding box used for shielding interference of the electromagnetic waves to the signal converter; the signal converter comprises a first part and a second part which are connected through optical fibers, wherein the first part is connected with the control module, the second part is connected with an M-Bus signal instrument to be detected, and the second part is arranged in the shielding box; the first part is used for realizing the conversion between the RS-232/485 signal and the optical signal, and the second part is used for realizing the conversion between the optical signal and the M-Bus signal; the radiation interference module comprises a cascaded signal source, a field intensity probe, a radio frequency change-over switch, an antenna group, a power amplifier group and a directional coupler, wherein the signal source is controlled by the control module; the control module adopts an industrial personal computer; the shielding box is made of an aluminum material, a wave absorbing material is arranged in the shielding box, an ST interface serving as an optical fiber interface is arranged on the shielding box, and the ST interface comprises an internal ST interface and an external ST interface; the external ST interface is connected with the first part of the signal converter, and the internal ST interface is connected with the second part of the signal converter; the shielding box is provided with an interface for connecting M-Bus signals, is connected through two-wire binding posts and does not divide the polarity; the system also comprises a video acquisition control module; the video acquisition control module comprises a camera and a remote controller, wherein the camera and the remote controller are used for observing the dynamic state of an M-Bus signal instrument display screen; the camera is remotely controlled by a remote controller to adjust the angle and the focal length;
the method is characterized by comprising the following steps of:
(1) Placing an M-Bus signal instrument to be detected in a half-wave dark room, wherein an antenna group, a shielding box and a camera are all positioned in the half-wave dark room;
(2) Inputting an M-Bus signal instrument number to be detected at an interface of an industrial personal computer, generating a serial port read data command string according to the rule of an industry standard CJ/T188 user-used metering instrument data transmission technical condition, adding a checksum byte, and simultaneously configuring serial port number, baud rate and frame format parameters;
(3) Setting a required field intensity through an industrial personal computer, and transmitting interference electromagnetic waves with the set field intensity to an M-Bus signal instrument to be detected through an antenna;
(4) At the moment, the test starts from the frequency of the designated frequency point, the industrial personal computer automatically sends a read data command character string, the M-Bus signal instrument receives the character string and then performs accumulation and verification, judges whether the character string is established normally or not, and returns a result character string;
(5) The industrial personal computer receives the character string output by the M-Bus instrument to be detected, analyzes the character string to obtain a specific numerical value, and automatically draws a graph with the frequency as an abscissa and the numerical value of the measured physical quantity of the M-Bus instrument as an ordinate by built-in software of the industrial personal computer;
(6) Judging whether the current test frequency point is ended or not, if not, returning to the step (3), and continuously detecting the next frequency point; and after all the frequency points are tested, the test is stopped, and the experimental result is judged by combining the curve graph.
2. The method for detecting the M-Bus signal instrument under the intentional radiation interference according to claim 1, wherein in the test process, a remote controller is used for adjusting the azimuth and the focal length of a camera, the auxiliary monitoring is carried out on the M-Bus signal instrument to be detected, if the M-Bus signal instrument has the phenomena of screen flash and screen black, the phenomena can be directly observed, and the judgment of the test result can be conveniently carried out by combining the graph in the step (5).
3. The method for detecting the M-Bus signal instrument under the intentional radiation interference according to claim 1 or 2, wherein in the step (3), the built-in software of the industrial personal computer automatically calls the calibration table, calculates the output level of the signal source according to a built-in formula of the software, outputs the power amplifier as 100% gain, and establishes the interference electromagnetic wave with the required field intensity.
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| CN109884405B (en) * | 2019-03-21 | 2021-01-22 | 重庆市计量质量检测研究院 | VR glasses comprehensive measurement method |
| CN112415320A (en) * | 2020-12-02 | 2021-02-26 | 一汽解放汽车有限公司 | Radiation anti-interference degree testing system and method based on automobile instrument |
| CN114061646A (en) * | 2021-09-18 | 2022-02-18 | 北京东方计量测试研究所 | Automatic verification equipment for universal instrument and meter |
| CN113884776B (en) * | 2021-10-08 | 2024-05-24 | 苏州市计量测试院 | Radio frequency electromagnetic field radiation immunity test method and device |
| CN116008713A (en) * | 2023-02-22 | 2023-04-25 | 中国人民解放军陆军工程大学 | Electromagnetic interference detection system of unmanned aerial vehicle flight control system |
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